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• RHEL 6.x on Rackspace Cloud and Dedicated hardware experiencing Redis Timeouts

  - by zhallett

  I just recently set up a mixture of RHEL 6.1 Rackspace cloud hosts and RHEL 6.2 dedicated hosts using Rackconnect. I am experiencing intermittent Redis timeouts from within our Rails 3.2.8 app with Redis 2.4.16 running on the RHEL 6.2 dedicated hosts. There is no network latency or packet loss. Also there are no errors on any interfaces on our cloud or dedicated servers or on the managed firewall from Rackspace. When Redis timesout, there is nothing logged within redis even though it is set up to do debug logging. The only error we receive is from Airbrake saying there was a Redis timeout. Network topology: RHEL 6.1 cloud hosts <--> Alert logic IDS <--> Cisco ASA 5510 <--> RHEL 6.2 dedicated hosts (web nodes) (two way NAT) (db hosts running redis) Ping from db host to web host: 64 bytes from 10.181.230.180: icmp_seq=998 ttl=64 time=0.520 ms 64 bytes from 10.181.230.180: icmp_seq=999 ttl=64 time=0.579 ms 64 bytes from 10.181.230.180: icmp_seq=1000 ttl=64 time=0.482 ms --- web1.xxxxxx.com ping statistics --- 1000 packets transmitted, 1000 received, 0% packet loss, time 999007ms rtt min/avg/max/mdev = 0.359/0.535/5.684/0.200 ms Ping from web host to db host: 64 bytes from 192.168.100.26: icmp_seq=998 ttl=64 time=0.544 ms 64 bytes from 192.168.100.26: icmp_seq=999 ttl=64 time=0.452 ms 64 bytes from 192.168.100.26: icmp_seq=1000 ttl=64 time=0.529 ms --- data1.xxxxxx.com ping statistics --- 1000 packets transmitted, 1000 received, 0% packet loss, time 999017ms rtt min/avg/max/mdev = 0.358/0.499/6.120/0.201 ms Redis config: daemonize yes pidfile /var/run/redis/6379/redis_6379.pid port 6379 timeout 0 loglevel debug logfile /var/lib/redis/log syslog-enabled yes syslog-ident redis-6379 syslog-facility local0 databases 16 save 900 1 save 300 10 save 60 10000 rdbcompression yes dbfilename dump-6379.rdb dir /var/lib/redis maxclients 10000 maxmemory-policy volatile-lru maxmemory-samples 3 appendfilename appendonly-6379.aof appendfsync everysec no-appendfsync-on-rewrite no auto-aof-rewrite-percentage 100 auto-aof-rewrite-min-size 64mb slowlog-log-slower-than 10000 slowlog-max-len 1024 vm-enabled no vm-swap-file /tmp/redis.swap vm-max-memory 0 vm-page-size 32 vm-pages 134217728 vm-max-threads 4 hash-max-zipmap-entries 512 hash-max-zipmap-value 64 list-max-ziplist-entries 512 list-max-ziplist-value 64 set-max-intset-entries 512 zset-max-ziplist-entries 128 zset-max-ziplist-value 64 activerehashing yes Redis-cli info: redis-cli info redis_version:2.4.16 redis_git_sha1:00000000 redis_git_dirty:0 arch_bits:64 multiplexing_api:epoll gcc_version:4.4.6 process_id:4174 uptime_in_seconds:79346 uptime_in_days:0 lru_clock:1064644 used_cpu_sys:13.08 used_cpu_user:19.81 used_cpu_sys_children:1.56 used_cpu_user_children:7.69 connected_clients:167 connected_slaves:0 client_longest_output_list:0 client_biggest_input_buf:0 blocked_clients:6 used_memory:15060312 used_memory_human:14.36M used_memory_rss:22061056 used_memory_peak:15265928 used_memory_peak_human:14.56M mem_fragmentation_ratio:1.46 mem_allocator:jemalloc-3.0.0 loading:0 aof_enabled:0 changes_since_last_save:166 bgsave_in_progress:0 last_save_time:1352823542 bgrewriteaof_in_progress:0 total_connections_received:286 total_commands_processed:507254 expired_keys:0 evicted_keys:0 keyspace_hits:1509 keyspace_misses:65167 pubsub_channels:0 pubsub_patterns:0 latest_fork_usec:690 vm_enabled:0 role:master db0:keys=6,expires=0 edit 1: add redis-cli info output

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• Best SQL Server Configuration with this hardware.

  - by DavidStein

  I just received my new SQL Server from Dell. The server will be serve approximately 15 OLTP databases which average 10GB in size. Here are the basic specs: Dell PowerEdge R510 with up to 12 Hot Swap HDDs,LED Intel Xeon E5649 2.53GHz, 12M Cache, 5.86 GT/s QPI, 6 core (Quantity of 2) 48GB Memory (6x8GB), 1333MHz Dual Ranked RDIMMs for 2 Processors, Optimized PERC H700 Integrated RAID Controller, 1GB NV Cache 300GB 15K RPM SA SCSI 6Gbps 3.5in Hotplug Hard Drive (Quantity of 4) 600GB 15K RPM SA SCSI 6Gbps 3.5in Hotplug Hard Drive (Quantity of 6) My first thought was to use 3 arrays. OS - Raid 1 - (2)300GB T-Log - Raid 1 (2)300GB DB - Raid 5 (5) 600GB Backup - (1) 600GB - non-raided. However, I could also do the following after purchasing one more drive for backup. OS and T-Log - Raid 10 - (4)300GB DB - Raid 10 (6)600GB The hard drive space is not an issue as the databases are not that large. I'm just trying to optimize the speed of the applications using these databases. So, what would you guys recommend?

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• Database checksum features - redundant? useful?

  - by Eloff

  Just about every mainstream DB has a feature to calculate checksums per page, per sector, or per record. Now for a DB that does full recover after any crash, like PostgreSQL, is a checksum even useful? There will be no data loss as long as the xlog is ok, no matter what kind of corruption happened to the data itself, as the redo log is replayed every committed transaction will be restored. So checksums are useless on restore. Doesn't the filesystem or disk keep checksums anyway to detect corruption? So unless the checksum is per record, all it does is tell you there is corruption - which the OS should be yelling at you the minute you try to read it - so useless in operation? I can't imagine how a checksum can be helpful in any sane database - but since they all use them - I'd say that's just failure of imagination on my part. So how is it useful?

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• How to throttle your own internet connection?

  - by darkAsPitch

  I am writing a website and want to test it's speed on slower internet connections. I have the unfortunate first world problem of downloading at 100mbps, how can I throttle my own computer's internet connection to 56kbps or 5mbps to give myself an idea of how my users might be downloading my website? EDIT: I am using Windows primarily but also have an ubuntu laptop if the answer is linux oriented.

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• The previous system shutdown at xxxx was unexpected

  - by m.edmondson

  For the past two nights we had a remote server shutdown unexpectedly. When rebooted we get the following message: Event Type: Error Event Source: EventLog Event Category: None Event ID: 6008 Date: 16/02/2011 Time: 09:10:43 User: N/A Computer: WELPLAN-1 Description: The previous system shutdown at 07:27:32 on 16/02/2011 was unexpected. For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp. Data: 0000: db 07 02 00 03 00 10 00 Û....... 0008: 07 00 1b 00 20 00 42 02 .... .B. 0010: db 07 02 00 03 00 10 00 Û....... 0018: 07 00 1b 00 20 00 42 02 .... .B. Obviously this message doesn't help much, but what does all the hexadecimal mean? Will it help me track down the problem? Any pointers as to where to look?

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• Command line import of database using latin1 encoding

  - by chrisjlee

  I'm using a particular cloud hosting solution (one which i won't name) and they don't provide ssh access so i'm at a whim on how the database is dumped. I downloaded the dump which is packed into a tar.gz file. I discover that this file utilizes latin1 encoding. Which i don't get to specify the encoding for the host i'm using because i don't have SSH access or DB access. I try to import it via command line for my local development environment (mysql -uroot foodb < file.db) like i usually do with other databases but am having problems. Is it possible to import a database via command line by specifying which encoding (preferably latin1) before importing it? Or do i have to convert it to UTF8?

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• Oracle account locked

  - by Priya

  Hi All, I had a user in my oracle DB with some 'x' password for sometime. Without notifying my team I changed the password to 'y'. But my team members tried to connect to the machine with the old passowrd 'x' and as the limit was set, the user account got locked. I know how to set the resource limit for the login. It would be helpful if anyone can help in finding who and all has tried to connect to the DB. As a administrator I would like to view from where the connection was from. Thanks in advance. Priya.R

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• How can I do an "insert" statement from MS SQL -> MYSQL using linked servers

  - by bvandrunen

  Is it possible to do an "insert" statement through linked servers. I know it is possible by using MSDTC...but does this work between MS SQL and MYSQL? Any help would be greatly appreciated. As of right now...I can update and select between the 2 databases but it gives me an error when I try to run an insert statement. OLE DB provider "MSDASQL" for linked server "******" returned message "Query-based insertion or updating of BLOB values is not supported.". Msg 7343, Level 16, State 2, Line 1 The OLE DB provider "MSDASQL" for linked server "******" could not INSERT INTO table "[*********]...[******_options]". Location: memilb.cpp:1493 Expression: (*ppilb)-m_cRef == 0 SPID: 76 Process ID: 1644

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• Paste textbox from Powerpoint to Word as an editable control

  - by George Harris

  I have a Powerpoint 2007 file that contains a number of textboxes and shapes with text on them. I can edit, resize, change the text, etc. in these boxes in Powerpoint. However, if I select an item, copy it, and paste it into a Word 2007 document, I can't edit it. I can resize the entire thing, but it acts more like an image than a text box. I've tried the paste special options and keep source formatting options, but still can't edit it. Is there a way to be able to paste the editable content from Powerpoint and still have it editable in Word? Update I found this question that appears to get to the root of the problem: The MS Office Art graphics engine (aka Escher 2) is new to MS Office 2007 and while fully implemented in Excel and Powerpoint is only partially implemented in Word 2007 for backwards compatibility with the MS Office Drawing/Graphics engine (aka Escher) still available in Word It should work in earlier versions of Word and Word 2010, but not Word 2007. This is quite frustrating as I have to edit the slide in Powerpoint before copying it into Word. While doable, it adds another step, but the problem is that everyone who wants to update the Word document will have to do the same thing, adding complexity and steps for everyone. If I embed the Powerpoint slide in the document, I can edit the controls, but they don't scale the same way and takes a lot of work.

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• How does one open multiple tabs in TextWrangler?

  - by Closure Cowboy

  No, I'm not bluffing. I really can't figure this out. The setup: I went to File -> Open, and then selected a directory rather than a file. As expected, a directory tree opened on the left side of my document. Hooray! I can easily view the files' structure in my Rails project. So, I make a few changes in a file, and then I click on a different file in the directory tree. My problem: TextWrangler then asks me whether I want to save my changes. Huh? I say "No", and the new document doesn't open at all. Great. I try hitting Command+N (new document). A new window opens. Ughhhh. How the heck do I open documents in a new tab? Note: I have set the "New & opened documents" behavior to "Open in the front window". This does not change the behavior described (i.e. when a directory is opened rather than a single file).

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• Windows Key is shutting my PC with Windows 7 down when pressed

  - by jasondavis

  I am having a really annoying problem lately with my Windows 7 PC. The problem, is all of a sudden, just within the last day or 2, anytime I hit the WIN (Windows keyboard key) instead of popping up the start menu, the system shuts down all my programs and trys to shut down, the only reason it doesn't suceed is because one of the programs I will have running will have an un-saved document, so it will ask me if I want to save the document before shutting down, I then can hit cancel and it halts the process. I do not remember installing anything and programs from from around the time it started doing this, maybe 2-3 days ago. I have gone through and searched Google for every Process running in the taskmanager to see which processes were REQUIRED for Windows to run, I then closed eveything down and killed all the non-essential Processes and the result was this... The reason you see notepad.exe is because I had it open with an unsaved document to keep the system from shutting down, I then tried hitting the win key after I shut each process down, after everything was shut to just show the above, it still tries to shut my system down, this is driving me insane, please help I am at a lost. I am about to see if I can try a different keyboard just encase it is some malfunction on the keyboard. The reason I need to access the WIN key or would like to is because I have Win + v set up to work with a special clipboard manager I believe it is called ClipX

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• back-end SQL server 2005 databases for website

  - by Datapimp23

  Hi, We're migrating an existing IIS website + MS SQL 2005 database (on the same server) to a new test set-up. The existing set-up is too slow. I want one ISS server and 2 X MS SQL server 2005. One live DB server for the website queries (inserts, updates) and another for backups, reports or stored procedures. So the live DB should be more aimed at performance. The other doesn't even need to be synced instantly. What is the best way in SQL server 2005 to set this up. Can somebody point me in the right direction and give me some pointers. Thanks

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• 'Internet Explorer cannot display the webpage'.

  - by BulletProof

  http://mts.varicentondemand.com URL is correct. It worked the other day. URL to pointing at db server and db was edited this morning in 'jdbc.properties' file and is correct. Nothing wrong with the pointers in that sense. To pick up the changes 'Apache Tomcat 6 was restarted. Everything should work, but the page is not coming up. Tried URL form local as well as the web/app server itself. Where to check for clues?

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• Mac OS X duplex printing problem: one- vs. multi-paged documents

  - by Christian Lindig

  I like to print on pre-printed stationery using the Preview.app and a duplex-capable HP Color Laserjet 4700 (PostScript) printer. The print dialog handles one and two-paged documents differently: the paper needs to be placed differently into the tray if the document contains one page versus when it contains two pages. This is not obvious when printing on plain paper but becomes obvious when front and reverse side of sheets are marked. Otherwise the first page would end up on the reverse side of the first sheet. I believe the problem is caused by the printer driver setting duplex printing to false (using the PostScript setpagedevice operator) when emitting a single-page document versus keeping it set to true when emitting multi-page documents. All this despite that duplex printing is always specified in the printer dialog. When printing a single-sided document, duplex=true and duplex=false seem to make a difference with respect which side of a sheet gets printed on. It would be also helpful if others could confirm the problem actually exists. I suspect this problem is not limited to specific printers. I'm on OS X 10.6 and I checked two different HP printers.

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• Oracle Advanced Security Options is Blank

  - by mak4pi

  I just installed Oracle DB 10gR2 with Oracle Advanced Security, but cannot see the algorithms. [user@db-1] adapters Installed Oracle Net transport protocols are: IPC BEQ TCP/IP SSL RAW Installed Oracle Net naming methods are: Local Naming (tnsnames.ora) Oracle Directory Naming Oracle Host Naming Oracle Names Server Naming Installed Oracle Advanced Security options are: Where are all the algorithms for Oracle Advanced Security options please? I checked the $ORACLE_HOME/bin/adapters file and it's looking for naea256i, naemd5i, etc. in the naetab.so file, but none of these are listed in the naetab.so file. What's wrong with the naetab.so file? Thanks.

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• how to connect public web server to internal LAN

  - by DefSol

  I have a VPS which is my public web server for all my clients. It's running server 2008 and I would like to have it connect via secure connection to my internal LAN. I would like this to be a route so access is bi-derectional. Have read about Server & Domain isolation, but am concerned this may prevent public views to the webs sites on the server. I currently have a PPTP tunnel, but I'm wanting better security (IPSec or SSL etc) and it's not given my bi derectional access. (In fact my backups aren't copying accross but this could be an acl issue) The goal is to provide easy/automated backups of data & sql db's to my internal LAN, as well as a means to provision new sites & db's from a workflow occuring internally. Internal lan is windows based with ISA 2006 at the perimeter. Thanks

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• Maintaining "Portability" Between Linux and Windows 7

  - by lokheart

  I am using the following ways in my office's Windows 7 machine to maintain my "portabilibity" when disaster strikes and I need to switch computer while I have no luxury of time for reinstalling all my program to the new PC. a majority of programs I used are portable, mostly from portableapp.com, like notepad+, GIMP, even R, I extract them and store them in a folder in My document, in a structure similar to the default portableapp installation when they are installed to a thumbdrive only a few software that portable version is not available and I will install them as usual all of my working files are stored in a folder in My document I regularly backup them all using syncback, because this program can keep versioning of my backup, and the backup is stored in a portable drive. One day I need to switch my computer and the operation is relative simple for me: I just move the two folders mentioned above into the my document folder of the new PC, install those few "non-portable" program in it, and this is almost done, some minor hiccups can be solved by reinstalling the portableapp into the drive. Overall speaking it is a smooth process. I would like to maintain the same degree of "portability" in my home Linux desktop (Ubuntu or Mint, I'm still deciding), that is, if my Linux crash and I need to reinstall it again. All I need to do is the move the two folder back to the new Linux, and most of my work will be almost ready to be worked on again. But I don't know how to find a Linux-alternative of portableapps. Being a newer to Linux, can anyone tell me whether this is possible in Linux?

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• How to get rid of Gmail's on "behalf of" using postfix

  - by user2815

  I'm using the default configuration of postfix on Ubuntu 9.04, and I've been trying to configure Gmail to send email through my server. I'm looking for a simple configuration for 10-15 users (like using a password file), but all the tutorials I have found have been too extensive and seem very enterprise-oriented. I just need to configure postfix with AUTH/TLS that is compatible with gmail.

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• MySQL replicate multiple places

  - by Frederik Nielsen

  Very trick task to find a good title for this question, but here goes the q: I have a few development machines, where I develop my PHP applications on, and testing via a local webserver. This works out pretty well for each machine. However, I would like to replicate the DB from my machines to a central location. So, to sum up: DEV1 - CENTRAL DEV2 - CENTRAL DEV3 - CENTRAL CENTRAL - DEV1 CENTRAL - DEV2 CENTRAL - DEV3 I hope this makes sense, as I cannot find an easy way to tell it. Basically, it is a 2-way replication, where all 4 databases contain the same info, and each of them can be updated locally, to then be pushed out to the others. Is this actually doable? All my dev machines are running Windows 7, and my central DB server is running CentOS 6.

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• Encrypt connection between apache web server and mysql server.

  - by microchasm

  I'm setting up a local webapp. I have a CentOS-5 box that will be the webserver (Apache 2.2). I have another box (RHEL5) that will be used only for MySQL. The data will be encrypted on the webserver via PHP before being sent to the MySQL box and inserted into the db. All web-based connections to the webserver will be encrypted via SSL. From the research I've done, it's not totally clear on whether or not there is a need to encrypt the connection to the db from webserver (NB paranoia level: Orange). If it is not overkill, or even if it is (unless it is a really bad idea for some reason), any advice or pointers on the direction to take to get this done would be appreciated.

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• AWS RDS Timeout

  - by warder57

  I know next to nothing about networking/servers. So I'm assuming I'm missing something obvious. All of the resources I can find on this, either don't work or are outdated. I created a brand new AWS account on the free plan. I created a postgres RDS DB instance. I made sure that this RDS instance is set to publicly accessible. This RDS instance has the default VPC/Security Group settings. In order to connect to this DB from my local machine, I used pgadmin3 and followed the instructions provided on the AWS documentation page. Seen here: http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_ConnectToPostgreSQLInstance.html I've double checked all of the information required to connect: Host: whatever.whatever.us-west-2.rds.amazonaws.com Port: 5432 Username: USERNAME Password: PASSWORD When I try to connect to the database, my connection fails due to a timeout. (During step 4 in the above guide.) Can anyone point me to whatever I am missing? Thanks in advance

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• How to purchase a silent power supply

  - by xain

  Hi, how many dB make a power supply silent? Any model recommendations ?

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• Generate a limited amount of random network traffic between 2 hosts

  - by Andrew S

  I'm trying to find a utility that will allow me to generate a constant flow of random network traffic at a specified rate between 2 hosts. The utility needs to run on Windows and OSX. I've tried iperf but it seems to be more oriented toward short-term testing/statistics and it really taxes the CPU even at slower rates. I want something that will generate traffic for a few weeks at say 10Mbps while I use other tools to monitor the impact of that level of traffic on the network.

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• SQL Server backup and restore process

  - by Nai

  Just wondering what backup processes you guys have. I am currently operating a weekly full database backup with daily differential backups. My understanding is that with such a set up, the difference between Full recovery mode and Simple recovery mode is that with Full recovery mode, I will be able to use the transaction logs to rollback my DB to a specific point in time having applied the latest differential backup. Assuming that in my scenario, the last differential backup serves as my last and ultimate 'save point', I don't see a need to rollback my DB even further back using the logs. This brings me to my question: Is there any additional benefits to be had using a Full recovery mode for my current backup process?

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• Mongodump on Gridfs is killing the host IOs

  - by Raphael

  I'm trying to make a mongodump from our production mongodb while the production is running. We have three production instances, one regular mongodb, one with very few gb of data on gridfs, one with a larger amount of data on gridfs. All mongodb instances are running in version 2.4.9 on a ubuntu 10.04 virtual server. I use a mongodump command to export the bases to another server. Unfortunately our machines are virtually hosted in a "low performances" datacenter (vmware based) so when I try to export the large gridfs db, the disk IO hits 100% (and 50% of the cpu starts waiting for IO too). This has a very negative impact on the production applicatiosn because db access time is excessively increased, making the applications unusable. I'm looking for a way to regulate the mongodump so the export goes slower but cooler on the hardware ressources allowing better performances for the applications to run. Has anyone had a similar scenario ?

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